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Fiberglass Door Finish Prevents Damage From Ultraviolet Light

Headquartered in Maumee, OH, Therma-Tru is a member of the National Council of the Housing Industry — the Supplier 100 of NAHB.

In rigorous testing in environmental chambers, Therma-Tru exposed fiberglass materials and stains to extreme temperatures and moisture exposure and found that ultraviolet rays not only damaged coatings but also penetrated the topcoat and stain into the fiberglass material.

To prevent the penetration of UV rays, light blockers were incorporated into the top coat and stain system. Together, they prohibit UV rays from breaking down the finish of Therma-Tru’s complete stain system. The manufacturer says that this system is unique to the industry and can withstand weathering over a long period of time.

“Therma-Tru’s patented finishing system, specifically formulated for Therma-Tru’s fiberglass doors, provides consistent performance against harsh weather conditions as well as the effects of harmful ultraviolet light and has a five-year satisfaction warranty,” the report says.

The finishing system was developed to be durable and apply easily for long-lasting good looks.

The finish can also be applied several weeks — or in some cases, months — after installation, the manufacturer says. Two weeks is the standard recommended finishing period for wood doors.

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